Another plug for the Hollyford and Fjordland. No Heli required, semi-roadside, yet still far enough from the road to feel wild in many places, numerous runs for various water levels, clearest turquoise water of all time and insane scenery, plus bonus runs on the Milford sound side which are sweet as, as well. Would add to Joe's list the Nevis River, Waikaia and the new run on the East fork Waikaia, and on the west coast Falls Creek and the Styx for other non heli runs. You basically go with the wish list and then see how water levels cooperate. Stay in Ross just south of Hoki for a coupla days at least and find a way to get Fjordland.
Oh, and hopefully I'm comin too so you wan't even need this beta.
Cub boater: "What do the spiders mean?" Old fart boater: "Trust your intuition." CRCII